<?php
/**
 * Where chat appears.
 *
 * @package StandChat
 */

namespace StandChat;

defined( 'ABSPATH' ) || exit;

/**
 * Decides whether the current front-end request is one of the pages chat
 * appears on. Depends only on the URL, so it's safe with full-page caching.
 */
final class Visibility {

	/**
	 * Whether the current page is in "Where chat appears".
	 */
	public static function current_page_included(): bool {
		$visibility = Settings::get( 'visibility' );
		$mode       = $visibility['mode'] ?? 'all';
		if ( 'all' === $mode ) {
			return true;
		}
		$matches = self::current_page_matches( $visibility['items'] ?? array() );
		return 'except' === $mode ? ! $matches : $matches;
	}

	/**
	 * Whether the current page matches any of the chosen entries.
	 *
	 * @param array<int, array<string, mixed>> $items Entries from the settings.
	 */
	private static function current_page_matches( array $items ): bool {
		// The posts page lists posts, and is a page that can be chosen too.
		$posts_page = (int) get_option( 'page_for_posts' );
		$queried_id = is_singular() || ( is_home() && $posts_page > 0 && (int) get_queried_object_id() === $posts_page ) ? (int) get_queried_object_id() : 0;
		$listing    = is_archive() || is_search() || is_404() || ( is_home() && ! is_front_page() );
		return self::matches( $items, $queried_id, is_front_page(), $listing );
	}

	/**
	 * Whether a page matches any of the chosen entries.
	 *
	 * @param array<int, array<string, mixed>> $items   Entries from the settings.
	 * @param int                              $post_id The post a single page shows, or 0.
	 * @param bool                             $front   Whether it's the front page.
	 * @param bool                             $listing Whether it's an archive, search results or the posts page.
	 */
	public static function matches( array $items, int $post_id, bool $front, bool $listing ): bool {
		$post_type = $post_id ? (string) get_post_type( $post_id ) : '';
		foreach ( $items as $item ) {
			$type = $item['type'] ?? '';
			if ( 'post' === $type && $post_id && (int) ( $item['id'] ?? 0 ) === $post_id ) {
				return true;
			}
			if ( 'front' === $type && $front ) {
				return true;
			}
			if ( 'post_type' === $type && '' !== $post_type && ( $item['name'] ?? '' ) === $post_type ) {
				return true;
			}
			if ( 'archives' === $type && $listing ) {
				return true;
			}
		}
		return false;
	}
}